5643887681 has 16 divisors (see below), whose sum is σ = 6003668160. Its totient is φ = 5287265280.

The previous prime is 5643887659. The next prime is 5643887707. The reversal of 5643887681 is 1867883465.

It is a cyclic number.

It is not a de Polignac number, because 5643887681 - 2²⁶ = 5576778817 is a prime.

It is a super-2 number, since 2×5643887681² = 63706936311487115522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5643887651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5776265 + ... + 5777241.

It is an arithmetic number, because the mean of its divisors is an integer number (375229260).

Almost surely, 2^5643887681 is an apocalyptic number.

It is an amenable number.

5643887681 is a deficient number, since it is larger than the sum of its proper divisors (359780479).

5643887681 is a wasteful number, since it uses less digits than its factorization.

5643887681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2224.

The product of its digits is 7741440, while the sum is 56.

The square root of 5643887681 is about 75125.8123483533. The cubic root of 5643887681 is about 1780.4349903738.

The spelling of 5643887681 in words is "five billion, six hundred forty-three million, eight hundred eighty-seven thousand, six hundred eighty-one".